Some 29% of smartphone-owning adults listen to podcasts using their smartphones at least once a month.
The only activity of those identified for which smartphones are the primary device is social media use.
Roughly half of US smartphone owners say they check their phone a few times an hour or every few minutes .
Smartphones have grown to represent almost 1 in 5 visits to US eCommerce retailers.
In 2015, 67% of mother Facebook users logged on to the social network via mobile phone, up from 60% in 2014 and just 45% in 2013.
PCs were the most popular game-playing devices, used in 62% of gamer households.
Four out of five US households owned a device used for video gaming, and there was an average of two gamers in each game-playing household.
US Smartphone penetration reached 77% of the US mobile subscriber market (13+) during Q1 2015.
Fully 55% of US consumers ages 12 and older who had ever listened to a podcast said they used a smartphone, tablet or portable audio player most frequently to do so.
Some 21% of online US adults aged 18-34 accessed the internet using only mobile devices in December 2014, up from 18% doing so last year.